The U.S. trade deficit in goods contracted more than expected in April as a surge in exports blunted rising imports, but economists cautioned the trend was unlikely to be sustainable, with businesses ramping up investment in artificial intelligence. The advance report from the Commerce Department on Friday suggested the three-month U.S.-backed war with Iran, which has disrupted shipping in the Strait of Hormuz, had yet to have a significant impact on the nation's trade flows. The artificial intelligence spending boom is largely dependent on imports, including computer chips.